One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18)(19,27)(20,23)(21,30)(22,26)(24,28)(25,31)(29,32) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,15)(12,13)(14,16)(17,19,21,20,22,28,31,29)(18,23,25,27,26,32,30,24)(1,3,5,4)(2,7,8,6)(10,13)(14,15)(17,20,21,28,22,29,31,19)(18,24,25,23,26,27,30,32)(9,11,12,16)(10,14,13,15)(19,28)(20,29)(23,32)(24,27)(1,4,5,3)(2,6,8,7)(19,28)(20,29)(23,32)(24,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.